Modified fluorooxymethylene group-containing perfluoropolyether

Abstract

The present invention provides compound of formulae (A1), (A2), (B1), (B2), (C1) and (C2) which can form a layer having water-repellency, oil-repellency and antifouling property as well as high friction durability: wherein each symbols are as defined in the specification.

The invention claimed is: 
     
       1. A perfluoro(poly)ether group containing silane compound of any of the formulae (A1), (A2), (B1), (B2), (C1) and (C2): 
       
         
           
           
               
               
           
         
         wherein:
 PFPE is each independently at each occurrence —(OC 4 F 8 ) a —(OC 3 F 6 ) b —(OC 2 F 4 ) c —(OCF 2 ) d —, 
 wherein a and b are each independently an integer of 0 or more and 30 or less, c and d are each independently an integer of 1 or more and 200 or less, the sum of a, b, c and d is an integer of 3 or more,
 in the formulae (A1), (A2), (B1), (C1) and (C2), a c/d ratio is 0.2 or more and 0.85 or less, and in the formula (B2), a c/d ratio is 0.2 or more and 0.7 or less, 
 and the occurrence order of the respective repeating units in parentheses with the subscript a, b, c or d is not limited in the formula; 
 
 Rf is each independently at each occurrence an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms; 
 R 1  is each independently at each occurrence a hydrogen atom or an alkyl group having 1-22 carbon atoms; 
 R 2  is each independently at each occurrence a hydroxyl group or a hydrolyzable group; 
 R 11  is each independently at each occurrence a hydrogen atom or a halogen atom; 
 R 12  is each independently at each occurrence a hydrogen atom or a lower alkyl group; 
 n is, in the formulae (A1), (A2), and (B1), independently per a unit (—SiR 1   n R 2   3-n ), an integer of 0-3, and in the formula (B2), n is 0; 
 there is at least one R 2  in the formulae (A1), (A2), (B1) and (B2); 
 X 1  is each independently a single bond or a 2-10 valent organic group; 
 X 2  is each independently at each occurrence a single bond or a divalent organic group; 
 t is each independently at each occurrence an integer of 1-10; 
 α is each independently an integer of 1-9; 
 α′ is each independently an integer of 1-9; 
 X 5  is each independently a single bond or a 2-10 valent organic group; 
 β is each independently an integer of 1-9; 
 β′ is each independently an integer of 1-9; 
 X 7  is each independently a single bond or a 2-10 valent organic group; 
 γ is each independently an integer of 1-9; 
 γ′ is each independently an integer of 1-9; 
 R a  is each independently at each occurrence —Z—SiR 71   p R 72   q R 73   r ; 
 Z is each independently at each occurrence an oxygen atom or a divalent organic group; 
 R 71  is each independently at each occurrence R a′ ; 
 R a′  has the same definition as that of R a ; 
 in R a , the number of Si atoms which are straightly linked via the Z group is up to five; 
 R 72  is each independently at each occurrence a hydroxyl group or a hydrolyzable group; 
 R 73  is each independently at each occurrence a hydrogen atom or a lower alkyl group; 
 p is each independently at each occurrence an integer of 0-3; 
 q is each independently at each occurrence an integer of 0-3; 
 r is each independently at each occurrence an integer of 0-3; 
 in one R a , the sum of p, q and r is 3, and there is at least one R 72  in the formula (C1) and (C2); 
 R b  is each independently at each occurrence a hydroxyl group or a hydrolyzable group; 
 R c  is each independently at each occurrence a hydrogen atom or a lower alkyl group; 
 k is each independently at each occurrence an integer of 1-3; 
 l is each independently at each occurrence an integer of 0-2; 
 m is each independently at each occurrence an integer of 0-2; and 
 the sum of k, l and m is 3 in each unit in parentheses with the subscript γ. 
 
       
     
     
       2. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein in the formulae (A1), (A2), (B1), (B2), (C1) and (C2), the c/d ratio 0.3 or more and 0.6 or less. 
     
     
       3. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein in PFPE:
 —(OC 4 F 8 ) a — is —(OCF 2 CF 2 CF 2 CF 2 ) a —, 
 —(OC 3 F 6 ) b — is —(OCF 2 CF 2 CF 2 ) b —, and 
 —(OC 2 F 4 ) c — is —(OCF 2 CF 2 ) c —. 
 
     
     
       4. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein Rf is a perfluoroalkyl group having 1-16 carbon atoms. 
     
     
       5. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein X 1 , X 5  and X 7  are each independently a 2-4 valent organic group, α, β and γ are each independently 1-3, and α′, β′ and γ′ are 1. 
     
     
       6. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein X 1 , X 5  and X 7  are a divalent organic group, α, β and γ are 1, and α′, β′ and γ′ are 1. 
     
     
       7. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein X 1 , X 5  and X 7  are each independently —(R 31 ) p′ —(X a ) q′ —
 wherein:
 R 31  is a single bond, —(CH 2 ) s′ — (wherein s′ is an integer of 1-20) or a o-, m- or p-phenylene group; 
 X a  is —(X b ) l′ — (wherein l′ is an integer of 1-10); 
 X b  is each independently at each occurrence selected from the group consisting of —O—, —S—, an o-, m- or p-phenylene group, —C(O)O—, —Si(R 33 ) 2 —, —(Si(R 33 ) 2 O) m′ —Si(R 33 ) 2 — (wherein m′ is an integer of 1-100), —CONR 34 —, —O—CONR 34 —, —NR 34 — and —(CH 2 ) n′ — (wherein n′ is an integer of 1-20); 
 R 33  is each independently at each occurrence a phenyl group, a C 1-6  alkyl group or a C 1-6  alkoxy group; 
 R 34  is each independently at each occurrence a hydrogen atom, a phenyl group or a C 1-6  alkyl group; 
 p′ is 0 or 1; 
 q′ is 0 or 1; 
 the occurrence order of the respective repeating units in parentheses with the subscript p′ or q′ is not limited in the formula; and 
 R 31  and X a  is may be substituted with one or more substituents selected from a fluorine atom, a C 1-3  alkyl group and a C 1-3  fluoroalkyl group. 
 
 
     
     
       8. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein X 1 , X 5  and X 7  are each independently selected from the group consisting of:
 —CH 2 O(CH 2 ) 2 —, 
 —CH 2 O(CH 2 ) 3 —, 
 —CH 2 O(CH 2 ) 6 —, 
 —CH 2 O(CH 2 ) 3 Si(CH 3 ) 2 OSi(CH 3 ) 2 (CH 2 ) 2 —, 
 —CH 2 O(CH 2 ) 3 Si(CH 3 ) 2 OSi(CH 3 ) 2 OSi(CH 3 ) 2 (CH 2 ) 2 —, 
 —CH 2 O(CH 2 ) 3 Si(CH 3 ) 2 O(Si(CH 3 ) 2 O) 2 Si(CH 3 ) 2 (CH 2 ) 2 —, 
 —CH 2 O(CH 2 ) 3 Si(CH 3 ) 2 O(Si(CH 3 ) 2 O) 3 Si(CH 3 ) 2 (CH 2 ) 2 —, 
 —CH 2 O(CH 2 ) 3 Si(CH 3 ) 2 O(Si(CH 3 ) 2 O) 10 Si(CH 3 ) 2 (CH 2 ) 2 —, 
 —CH 2 O(CH 2 ) 3 Si(CH 3 ) 2 O(Si(CH 3 ) 2 O) 20 Si(CH 3 ) 2 (CH 2 ) 2 —, 
 —CH 2 OCH 2 (CH 2 ) 7 CH 2 Si(OCH 3 ) 2 OSi(OCH 3 ) 2 (CH 2 ) 2 Si(OCH 3 ) 2 OSi(OCH 3 ) 2 (CH 2 ) 2 —, 
 —CH 2 OCH 2 CH 2 CH 2 Si(OCH 3 ) 2 OSi(OCH 3 ) 2 (CH 2 ) 3 —, 
 —CH 2 OCH 2 CH 2 CH 2 Si(OCH 2 CH 3 ) 2 OSi(OCH 2 CH 3 ) 2 (CH 2 ) 3 —, 
 —CH 2 OCH 2 CH 2 CH 2 Si(OCH 3 ) 2 OSi(OCH 3 ) 2 (CH 2 ) 2 —, 
 —CH 2 OCH 2 CH 2 CH 2 Si(OCH 2 CH 3 ) 2 OSi(OCH 2 CH 3 ) 2 (CH 2 ) 2 —, 
 —(CH 2 ) 2 —, 
 —(CH 2 ) 3 —, 
 —(CH 2 ) 4 —, 
 —(CH 2 ) 6 —, 
 —CONH—(CH 2 ) 3 —, 
 —CON(CH 3 )—(CH 2 ) 3 —, 
 —CON(Ph)-(CH 2 ) 3 — (wherein Ph is a phenyl group), 
 —CONH—(CH 2 ) 6 —, 
 —CON(CH 3 )—(CH 2 ) 6 —, 
 —CON(Ph)-(CH 2 ) 6 — (wherein Ph is a phenyl group), 
 —CONH—(CH 2 ) 2 NH(CH 2 ) 3 —, 
 —CONH—(CH 2 ) 6 NH(CH 2 ) 3 —, 
 —CH 2 O—CONH—(CH 2 ) 3 —, 
 —CH 2 O—CONH—(CH 2 ) 6 —, 
 —S—(CH 2 ) 3 —, 
 —(CH 2 ) 2 S(CH 2 ) 3 —, 
 —CONH—(CH 2 ) 3 Si(CH 3 ) 2 OSi(CH 3 ) 2 (CH 2 ) 2 —, 
 —CONH—(CH 2 ) 3 Si(CH 3 ) 2 OSi(CH 3 ) 2 OSi(CH 3 ) 2 (CH 2 ) 2 —, 
 —CONH—(CH 2 ) 3 Si(CH 3 ) 2 O(Si(CH 3 ) 2 O) 2 Si(CH 3 ) 2 (CH 2 ) 2 —, 
 —CONH—(CH 2 ) 3 Si(CH 3 ) 2 O(Si(CH 3 ) 2 O) 3 Si(CH 3 ) 2 (CH 2 ) 2 —, 
 —CONH—(CH 2 ) 3 Si(CH 3 ) 2 O(Si(CH 3 ) 2 O) 10 Si(CH 3 ) 2 (CH 2 ) 2 —, 
 —CONH—(CH 2 ) 3 Si(CH 3 ) 2 O(Si(CH 3 ) 2 O) 20 Si(CH 3 ) 2 (CH 2 ) 2 —, 
 —C(O)O—(CH 2 ) 3 —, 
 —C(O)O—(CH 2 ) 6 —, 
 —CH 2 —O—(CH 2 ) 3 —Si(CH 3 ) 2 —(CH 2 ) 2 —Si(CH 3 ) 2 —(CH 2 ) 2 —, 
 —CH 2 —O—(CH 2 ) 3 —Si(CH 3 ) 2 —(CH 2 ) 2 —Si(CH 3 ) 2 —CH(CH 3 )—, 
 —CH 2 —O—(CH 2 ) 3 —Si(CH 3 ) 2 —(CH 2 ) 2 —Si(CH 3 ) 2 —(CH 2 ) 3 —, 
 —CH 2 —O—(CH 2 ) 3 —Si(CH 3 ) 2 —(CH 2 ) 2 —Si(CH 3 ) 2 —CH(CH 3 )—CH 2 —, 
 
       
         
           
           
               
               
           
         
       
     
     
       9. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein
 X 1  is —O—CFR 13 —(CF 2 ) e —, 
 R 13  is a fluorine atom or a lower fluoroalkyl group, and 
 e is 0 or 1. 
 
     
     
       10. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein X 2  is —(CH 2 ) s —, and s is an integer of 0-2. 
     
     
       11. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein in the formula (C1) and (C2), k is 3, and q is 3 in R a . 
     
     
       12. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein X 1 , X 5  and X 7  are each independently a 3-10 valent organic group. 
     
     
       13. The perfluoro(poly)ether group containing silane compound according to  claim 1  wherein X 1 , X 5  and X 7  are each independently selected from the group consisting of: 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         wherein in each group, at least one of T is the following group attached to PFPE in the formulae (A1), (A2), (B1), (B2), (C1) and (C2): 
         —CH 2 O(CH 2 ) 2 —, 
         —CH 2 O(CH 2 ) 3 —, 
         —CF 2 O(CH 2 ) 3 —, 
         —(CH 2 ) 2 —, 
         —(CH 2 ) 3 —, 
         —(CH 2 ) 4 —, 
         —CONH—(CH 2 ) 3 —, 
         —CON(CH 3 )—(CH 2 ) 3 —, 
         —CON(Ph)-(CH 2 ) 3 — (wherein Ph is a phenyl group), and 
       
       
         
           
           
               
               
           
         
         
           at least one of the other T is —(CH 2 ) n — (wherein n is an integer of 2-6) attached to the carbon atom or the Si atom in the formulae (A1), (A2), (B1), (B2), (C1) and (C2) and the others are each independently a methyl group, a phenyl group, or a alkoxy having 1-6 carbon atoms, 
           R 41  is a hydrogen atom, a phenyl group, an alkoxy group having 1 to 6 carbon atoms or an alkyl group having 1 to 6 carbon atoms, and 
           R 42  is a hydrogen atom or a C 1-6  alkyl group. 
         
       
     
     
       14. A compound of any one of the formulae (B1-4), (B2-4), (C1-4) and (C2-4):
   (Rf-PFPE) β′ —X 5′ —(R 82 —CH═CH 2 ) β   (B1-4)
 
   (CH 2 ═CH—R 82 ) β —X 5′ -PFPE-X 5′ —(R 82 —CH═CH 2 ) β   (B2-4)
 
   (Rf-PFPE) γ′ —X 7′ —(R 82 —CH═CH 2 ) γ   (C1-4)
 
   (CH 2 ═CH—R 82 ) γ —X 7′ -PFPE-X 7′ —(R 82 —CH═CH 2 ) γ   (C2-4)
 
 wherein:
 PFPE is each independently at each occurrence —(OC 4 F 8 ) a —(OC 3 F 6 ) b —(OC 2 F 4 ) c —(OCF 2 ) d —, 
 wherein a and b are each independently an integer of 0 or more and 30 or less, c and d are each independently an integer of 1 or more and 200 or less, the sum of a, b, c and d is an integer of 3 or more,
 in the formulae (B1-4), (C1-4) and (C2-4), the c/d ratio is 0.2 or more and 0.85 or less, and in the formula (B2-4), a c/d ratio is 0.2 or more and 0.7 or less, 
 
 and the occurrence order of the respective repeating units in parentheses with the subscript a, b, c or d is not limited in the formula; 
 Rf is each independently at each occurrence an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms; 
 X 5′  is each independently a single bond or a 2-10 valent organic group; 
 β is each independently an integer of 1-9; 
 β′ is each independently an integer of 1-9; 
 
 X 7′  is each independently a single bond or a 2-10 valent organic group; 
 γ is each independently an integer of 1-9; 
 γ′ is each independently an integer of 1-9; and 
 R 82  is a single bond or a divalent organic group. 
 
     
     
       15. A compound of any one of the formulae (C1-5) and (C2-5):
   (Rf-PFPE) γ′ -X 7′ —(R 82 —CH 2 CH 2 —SiR 83   k R b   l R c   m ) γ   (C1-5)
 
   (R c   m R b   l R 83   k Si—CH 2 CH 2 —R 82 ) γ —X 7′ -PFPE-**X 7′ —(R 82 —CH 2 CH 2 —SiR 83   k R b   l R c   m ) γ   (C2-5)
 
 wherein:
 PFPE is each independently at each occurrence —(OC 4 F 8 ) a —(OC 3 F 6 ) b —(OC 2 F 4 ) c —(OCF 2 ) d —, wherein a and b are each independently an integer of 0 or more and 30 or less, c and d are each independently an integer of 1 or more and 200 or less, the sum of a, b, c and d is an integer of 3 or more, a c/d ratio is 0.2 or more and 0.85 or less, and the occurrence order of the respective repeating units in parentheses with the subscript a, b, c or d is not limited in the formula; 
 Rf is each independently at each occurrence an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms; 
 X 7′  is each independently a single bond or a 2-10 valent organic group; 
 γ is each independently an integer of 1-9; 
 γ′ is each independently an integer of 1-9; 
 R 82  is a single bond or a divalent organic group; 
 R 83  is a halogen atom; 
 R b  is each independently at each occurrence a hydroxyl group or a hydrolyzable group; 
 R c  is each independently at each occurrence a hydrogen atom or a lower alkyl group; 
 k is each independently at each occurrence an integer of 1-3; 
 l is each independently at each occurrence an integer of 0-2; 
 m is each independently at each occurrence an integer of 0-2; and 
 the sum of k, l and m is 3 in each unit in parentheses with the subscript γ. 
 
 
     
     
       16. A compound of any one of the formulae (C1-6) and (C2-6):
   (Rf-PFPE) γ′ -X 7′ —(R 82 —CH 2 CH 2 —SiR b   l R c   m (R 84 —CH═CH 2 ) k ) γ   (C1-6)
 
   ((CH═CH 2 —R 84 ) k R c   m R b   l Si—CH 2 CH 2 —R 82 ) γ —X 7′ -PFPE-**X 7′ —(R 82 —CH 2 CH 2 —SiR b   l R c   m (R 84 —CH═CH 2 ) k ) γ   (C2-6)
 
 wherein:
 PFPE is each independently at each occurrence —(OC 4 F 8 ) a —(OC 3 F 6 ) b —(OC 2 F 4 ) c —(OCF 2 ) d —, wherein a and b are each independently an integer of 0 or more and 30 or less, c and d are each independently an integer of 1 or more and 200 or less, the sum of a, b, c and d is an integer of 3 or more, a c/d ratio is 0.2 or more and 0.85 or less, and the occurrence order of the respective repeating units in parentheses with the subscript a, b, c or d is not limited in the formula; 
 Rf is each independently at each occurrence an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms; 
 X 7′  is each independently a single bond or a 2-10 valent organic group; 
 γ is each independently an integer of 1-9; 
 γ′ is each independently an integer of 1-9; 
 R 82  is a single bond or a divalent organic group; 
 R 84  is a single bond or a divalent organic group; 
 R b  is each independently at each occurrence a hydroxyl group or a hydrolyzable group; 
 R c  is each independently at each occurrence a hydrogen atom or a lower alkyl group; 
 k is each independently at each occurrence an integer of 1-3; 
 l is each independently at each occurrence an integer of 0-2; 
 m is each independently at each occurrence an integer of 0-2; and 
 the sum of k, l and m is 3 in the unit in parentheses with the subscript γ. 
 
 
     
     
       17. The compound according to  claim 15  wherein k is 3. 
     
     
       18. The compound according to  claim 14  wherein X 5′  and X 7′  are a divalent organic group, β and γ are 1, and β′ and γ′ are 1. 
     
     
       19. A mixture comprising the compound of  claim 14  and a fluorine-containing oil and/or a solvent. 
     
     
       20. The mixture according to  claim 19  wherein the fluorine-containing oil is one or more compounds of the formula (3):
   R 21 —(OC 4 F 8 ) a′ —(OC 3 F 6 ) b′ —(OC 2 F 4 ) c′ —(OCF 2 ) d′ —R 22   (3)
 
 wherein:
 R 21  is an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms; 
 R 22  is an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms, a fluorine atom or a hydrogen atom; and 
 a′, b′, c′ and d′ are the repeating number of each of four repeating units of perfluoro(poly)ether which constitute a main backbone of the polymer, and are each independently an integer of 0 or more and 300 or less, the sum of a′, b′, c′ and d′ is 1 or more, and the occurrence order of the respective repeating units in parentheses with the subscript a′, b′, c′ and d′ is not limited in the formula. 
 
 
     
     
       21. The mixture according to  claim 19  wherein the fluorine-containing oil is one or more compounds of the formula (3a) or (3b):
   R 21 —(OCF 2 CF 2 CF 2 ) b″ —R 22   (3a)
 
   R 21 —(OCF 2 CF 2 CF 2 CF 2 ) a″ —(OCF 2 CF 2 CF 2 ) b″ —(OCF 2 CF 2 ) c″ —(OCF 2 ) d″ —R 22   (3b)
 
 wherein:
 R 21  is an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms; 
 R 22  is an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms, a fluorine atom or a hydrogen atom; 
 in the formula (3a), b″ is an integer of 1 or more and 100 or less; 
 in the formula (3b), a″ and b″ are each independently an integer of 0 or more and 30 or less, and c″ and d″ are each independently an integer of 1 or more and 300 or less; and 
 the occurrence order of the respective repeating units in parentheses with the subscript a″, b″, c″ or d″ is not limited in the formula. 
 
 
     
     
       22. A surface-treating agent comprising the perfluoro(poly)ether group containing silane compound according to  claim 1 . 
     
     
       23. The surface-treating agent according to  claim 22  wherein the perfluoro(poly)ether group containing silane compound is at least one compound of any one of the formulae (A1) and (A2). 
     
     
       24. The surface-treating agent according to  claim 22  wherein the perfluoro(poly)ether group containing silane compound is at least one compound of any one of the formulae (B1) and (B2). 
     
     
       25. The surface-treating agent according to  claim 22  wherein the perfluoro(poly)ether group containing silane compound is at least one compound of any one of the formulae (C1) and (C2). 
     
     
       26. The surface-treating agent according to  claim 22  further comprising one or more components selected form a fluorine-containing oil, a silicone oil, and a catalyst. 
     
     
       27. The surface-treating agent according to  claim 26  wherein the fluorine-containing oil is one or more compounds of the formula (3):
   R 21 —(OC 4 F 8 ) a′ —(OC 3 F 6 ) b′ —(OC 2 F 4 ) c′ —(OCF 2 ) d′ —R 22   (3)
 
 wherein:
 R 21  is an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms; 
 R 22  is an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms, a fluorine atom or a hydrogen atom; and 
 a′, b′, c′ and d′ are the repeating number of each of four repeating units of perfluoro(poly)ether which constitute a main backbone of the polymer, and are each independently an integer of 0 or more and 300 or less, the sum of a′, b′, c′ and d′ is 1 or more, and the occurrence order of the respective repeating units in parentheses with the subscript a′, b′, c′ and d′ is not limited in the formula. 
 
 
     
     
       28. The surface-treating agent according to  claim 26  wherein the fluorine-containing oil is one or more compounds of the formula (3a) or (3b):
   R 21 —(OCF 2 CF 2 CF 2 ) b″ —R 22   (3a)
 
   R 21 —(OCF 2 CF 2 CF 2 CF 2 ) a″ —(OCF 2 CF 2 CF 2 ) b″ —(OCF 2 CF 2 ) c″ —(OCF 2 ) d″ —R 22   (3b)
 
 wherein:
 R 21  is an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms; 
 R 22  is an alkyl group having 1-16 carbon atoms which may be substituted by one or more fluorine atoms, a fluorine atom or a hydrogen atom; 
 in the formula (3a), b″ is an integer of 1 or more and 100 or less; 
 in the formula (3b), a″ and b″ are each independently an integer of 0 or more and 30 or less, and c″ and d″ are each independently an integer of 1 or more and 300 or less; and 
 the occurrence order of the respective repeating units in parentheses with the subscript a″, b″, c″ or d″ is not limited in the formula. 
 
 
     
     
       29. The surface-treating agent according to  claim 28  wherein a mass ratio of the perfluoro(poly)ether group containing silane compound and the compound of the formula (3b) is 4:1-1:4. 
     
     
       30. The surface-treating agent according to  claim 28  wherein the compound of the formula (3a) has a number average molecular weight of 2,000-8,000. 
     
     
       31. The surface-treating agent according to  claim 28  wherein the compound of the formula (3b) has a number average molecular weight of 8,000-30,000. 
     
     
       32. The surface-treating agent according to  claim 28  wherein the fluorine-containing oil is one or more compounds of the formula (3b) wherein a c″/d″ ratio is 0.2 or more and less than 0.9. 
     
     
       33. The surface-treating agent according to  claim 22  further comprising a solvent. 
     
     
       34. The surface-treating agent according to  claim 22  which is used as an antifouling-coating agent or a water-proof coating agent. 
     
     
       35. The surface-treating agent according to  claim 22  for vacuum deposition. 
     
     
       36. A pellet comprising the surface-treating agent according to  claim 22 . 
     
     
       37. An article comprising a base material and a layer which is formed on a surface of the base material from the compound according to  claim 1 . 
     
     
       38. The article according to  claim 37  wherein the base material is a glass or a sapphire glass. 
     
     
       39. The article according to  claim 38  wherein the glass is a glass selected from the group consisting of a soda-lime glass, an alkali aluminosilicate glass, a borosilicate glass, a non-alkaline glass, a crystal glass, and a quartz glass. 
     
     
       40. The article according to  claim 37  wherein the article is an optical member. 
     
     
       41. The article according to  claim 37  wherein the article is a display. 
     
     
       42. The perfluoro(poly)ether group containing silane compound according to  claim 1 ,
 wherein 
 X 1 , X 5  and X 7  are divalent organic group, α, β and γ are 1, and α′, β′ and γ′ are 1; 
 X 1 , X 5  and X 7  are each independently —(R 31 ) p′ —(X a ) q′ —; 
 R 31  is a single bond, —(CH 2 ) s′ — (wherein s′ is an integer of 1-20) or a o-, m- or p-phenylene group; 
 Xa is -(X b ) l′ — (wherein 1′ is an integer of 1-10); 
 X b  is each independently at each occurrence selected from the group consisting of —O—, —S—, an o-, m- or p-phenylene group, —C(O)O—, —Si(R 33 ) 2 —, —(Si(R 33 ) 2 O) m′ —Si(R 33 ) 2 — (wherein m′ is an integer of 1-100), —CONR 34 —, —O—CONR 34 —, —NR 34 — and —(CH 2 ) n′ — (wherein n′ is an integer of 1-20); 
 R 33  is each independently at each occurrence a phenyl group, a C 1-6  alkyl group or a C 1-6  alkoxy group; 
 R 34  is each independently at each occurrence a hydrogen atom, a phenyl group or a C 1-6  alkyl group; 
 p′ is 0 or 1; 
 q′ is 0 or 1; 
 the occurrence order of the respective repeating units in parentheses with the subscript p′ or q′ is not limited in the formula; and 
 R 31  and X′ is may be substituted with one or more substituents selected from a fluorine atom, a C 1-3  alkyl group and a C 1-3  fluoroalkyl group.